INTEREST EXPENSE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Paid	$ 40,619	$ 50,611	$ 14,976
Interest on long-term debt and other financing arrangements	64,855	89,602	95,419
Amortization of capitalized debt issuance costs	5,778	8,842	15,118
Amortization of debt issuance discount	0	12,945	41,230
Total interest expense	$ 70,633	$ 111,389	$ 151,767